I currently have the Mad Dogs, and I'm on the waiting list for an Alpha Dog upgrade. I'm powering these with an O2, but I'm considering upgrading to a tube amp to use with the Mad Dogs and ultimately the Alpha Dogs in a month or two (Hopefully my name comes up for an upgrade soon!).
Does anyone have any experience with the Alpha Dogs powered by a tube amp ~$300? I'm considering the Project Ember since I've seen at least one or two others here with that, but I'm still not certain if I'm going to get that one. Any guidance would be appreciated